android - Android httpget 无法正常工作

Question

我在通过 android 中的 httpget 执行 url 时遇到问题。

try 
    {   
        DefaultHttpClient client = new DefaultHttpClient();
        HttpGet getURL = new HttpGet("http://www.example.com/index.php?text=x");
        client.execute(getURL);
        Toast.makeText(this.getBaseContext(), "I'm here", Toast.LENGTH_LONG).show();
    } catch (Exception e) {
        Toast.makeText(this.getBaseContext(), "Code Failed:" + e.getLocalizedMessage(), Toast.LENGTH_LONG).show();
        }

出于某种原因，我的应用程序将显示一个带有消息的 Toeast：“代码失败：空”。我只想执行一个 URL。当 URL 被调用时，我的 php 文件将更新数据库中的一条记录。我只想在我的 mysql 数据库中更新/插入数据库。所以不需要解析 json/xml/other 响应。

如果我在 logcat 中显示我的异常，这就是我所看到的：

11-14 13:56:39.255: E/MYAPP(19638): exception
11-14 13:56:39.255: E/MYAPP(19638): android.os.NetworkOnMainThreadException
11-14 13:56:39.255: E/MYAPP(19638):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
11-14 13:56:39.255: E/MYAPP(19638):     at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
11-14 13:56:39.255: E/MYAPP(19638):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-14 13:56:39.255: E/MYAPP(19638):     at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-14 13:56:39.255: E/MYAPP(19638):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
11-14 13:56:39.255: E/MYAPP(19638):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
11-14 13:56:39.255: E/MYAPP(19638):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
11-14 13:56:39.255: E/MYAPP(19638):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
11-14 13:56:39.255: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:670)
11-14 13:56:39.255: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
11-14 13:56:39.255: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
11-14 13:56:39.255: E/MYAPP(19638):     at com.thepl.shopapp.MainActivity.onCreate(MainActivity.java:156)
11-14 13:56:39.255: E/MYAPP(19638):     at android.app.Activity.performCreate(Activity.java:5184)
11-14 13:56:39.255: E/MYAPP(19638):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
11-14 13:56:39.255: E/MYAPP(19638):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
11-14 13:56:39.255: E/MYAPP(19638):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
11-14 13:56:39.255: E/MYAPP(19638):     at android.app.ActivityThread.access$600(ActivityThread.java:140)
11-14 13:56:39.255: E/MYAPP(19638):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
11-14 13:56:39.255: E/MYAPP(19638):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-14 13:56:39.255: E/MYAPP(19638):     at android.os.Looper.loop(Looper.java:137)
11-14 13:56:39.255: E/MYAPP(19638):     at android.app.ActivityThread.main(ActivityThread.java:4898)
11-14 13:56:39.255: E/MYAPP(19638):     at java.lang.reflect.Method.invokeNative(Native Method)
11-14 13:56:39.255: E/MYAPP(19638):     at java.lang.reflect.Method.invoke(Method.java:511)
11-14 13:56:39.255: E/MYAPP(19638):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
11-14 13:56:39.255: E/MYAPP(19638):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
11-14 13:56:39.255: E/MYAPP(19638):     at dalvik.system.NativeStart.main(Native Method)
11-14 13:56:58.205: E/MYAPP(19638): exception
11-14 13:56:58.205: E/MYAPP(19638): android.os.NetworkOnMainThreadException
11-14 13:56:58.205: E/MYAPP(19638):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
11-14 13:56:58.205: E/MYAPP(19638):     at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
11-14 13:56:58.205: E/MYAPP(19638):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-14 13:56:58.205: E/MYAPP(19638):     at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-14 13:56:58.205: E/MYAPP(19638):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
11-14 13:56:58.205: E/MYAPP(19638):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
11-14 13:56:58.205: E/MYAPP(19638):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
11-14 13:56:58.205: E/MYAPP(19638):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
11-14 13:56:58.205: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:670)
11-14 13:56:58.205: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
11-14 13:56:58.205: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
11-14 13:56:58.205: E/MYAPP(19638):     at com.thepl.shopapp.MainActivity.onCreate(MainActivity.java:156)
11-14 13:56:58.205: E/MYAPP(19638):     at android.app.Activity.performCreate(Activity.java:5184)
11-14 13:56:58.205: E/MYAPP(19638):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
11-14 13:56:58.205: E/MYAPP(19638):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
11-14 13:56:58.205: E/MYAPP(19638):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
11-14 13:56:58.205: E/MYAPP(19638):     at android.app.ActivityThread.access$600(ActivityThread.java:140)
11-14 13:56:58.205: E/MYAPP(19638):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
11-14 13:56:58.205: E/MYAPP(19638):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-14 13:56:58.205: E/MYAPP(19638):     at android.os.Looper.loop(Looper.java:137)
11-14 13:56:58.205: E/MYAPP(19638):     at android.app.ActivityThread.main(ActivityThread.java:4898)
11-14 13:56:58.205: E/MYAPP(19638):     at java.lang.reflect.Method.invokeNative(Native Method)
11-14 13:56:58.205: E/MYAPP(19638):     at java.lang.reflect.Method.invoke(Method.java:511)
11-14 13:56:58.205: E/MYAPP(19638):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
11-14 13:56:58.205: E/MYAPP(19638):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
11-14 13:56:58.205: E/MYAPP(19638):     at dalvik.system.NativeStart.main(Native Method)
11-14 13:56:59.100: E/MYAPP(19638): exception
11-14 13:56:59.100: E/MYAPP(19638): android.os.NetworkOnMainThreadException
11-14 13:56:59.100: E/MYAPP(19638):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
11-14 13:56:59.100: E/MYAPP(19638):     at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
11-14 13:56:59.100: E/MYAPP(19638):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-14 13:56:59.100: E/MYAPP(19638):     at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-14 13:56:59.100: E/MYAPP(19638):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
11-14 13:56:59.100: E/MYAPP(19638):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
11-14 13:56:59.100: E/MYAPP(19638):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
11-14 13:56:59.100: E/MYAPP(19638):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
11-14 13:56:59.100: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:670)
11-14 13:56:59.100: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
11-14 13:56:59.100: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
11-14 13:56:59.100: E/MYAPP(19638):     at com.thepl.shopapp.MainActivity.onCreate(MainActivity.java:156)
11-14 13:56:59.100: E/MYAPP(19638):     at android.app.Activity.performCreate(Activity.java:5184)
11-14 13:56:59.100: E/MYAPP(19638):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
11-14 13:56:59.100: E/MYAPP(19638):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
11-14 13:56:59.100: E/MYAPP(19638):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
11-14 13:56:59.100: E/MYAPP(19638):     at android.app.ActivityThread.access$600(ActivityThread.java:140)
11-14 13:56:59.100: E/MYAPP(19638):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
11-14 13:56:59.100: E/MYAPP(19638):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-14 13:56:59.100: E/MYAPP(19638):     at android.os.Looper.loop(Looper.java:137)
11-14 13:56:59.100: E/MYAPP(19638):     at android.app.ActivityThread.main(ActivityThread.java:4898)
11-14 13:56:59.100: E/MYAPP(19638):     at java.lang.reflect.Method.invokeNative(Native Method)
11-14 13:56:59.100: E/MYAPP(19638):     at java.lang.reflect.Method.invoke(Method.java:511)
11-14 13:56:59.100: E/MYAPP(19638):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
11-14 13:56:59.100: E/MYAPP(19638):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
11-14 13:56:59.100: E/MYAPP(19638):     at dalvik.system.NativeStart.main(Native Method)
11-14 13:57:21.185: E/MYAPP(19638): exception
11-14 13:57:21.185: E/MYAPP(19638): android.os.NetworkOnMainThreadException
11-14 13:57:21.185: E/MYAPP(19638):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
11-14 13:57:21.185: E/MYAPP(19638):     at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
11-14 13:57:21.185: E/MYAPP(19638):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-14 13:57:21.185: E/MYAPP(19638):     at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-14 13:57:21.185: E/MYAPP(19638):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
11-14 13:57:21.185: E/MYAPP(19638):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
11-14 13:57:21.185: E/MYAPP(19638):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
11-14 13:57:21.185: E/MYAPP(19638):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
11-14 13:57:21.185: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:670)
11-14 13:57:21.185: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
11-14 13:57:21.185: E/MYAPP(19638):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
11-14 13:57:21.185: E/MYAPP(19638):     at com.thepl.shopapp.MainActivity.onCreate(MainActivity.java:156)
11-14 13:57:21.185: E/MYAPP(19638):     at android.app.Activity.performCreate(Activity.java:5184)
11-14 13:57:21.185: E/MYAPP(19638):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
11-14 13:57:21.185: E/MYAPP(19638):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
11-14 13:57:21.185: E/MYAPP(19638):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
11-14 13:57:21.185: E/MYAPP(19638):     at android.app.ActivityThread.access$600(ActivityThread.java:140)
11-14 13:57:21.185: E/MYAPP(19638):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
11-14 13:57:21.185: E/MYAPP(19638):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-14 13:57:21.185: E/MYAPP(19638):     at android.os.Looper.loop(Looper.java:137)
11-14 13:57:21.185: E/MYAPP(19638):     at android.app.ActivityThread.main(ActivityThread.java:4898)
11-14 13:57:21.185: E/MYAPP(19638):     at java.lang.reflect.Method.invokeNative(Native Method)
11-14 13:57:21.185: E/MYAPP(19638):     at java.lang.reflect.Method.invoke(Method.java:511)
11-14 13:57:21.185: E/MYAPP(19638):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
11-14 13:57:21.185: E/MYAPP(19638):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
11-14 13:57:21.185: E/MYAPP(19638):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

您应该在主 UI 线程上进行网络调用。以下是异常的定义：

当应用程序尝试在其主线程上执行网络操作时引发的异常。

这仅针对面向 Honeycomb SDK 或更高版本的应用程序抛出。允许以早期 SDK 版本为目标的应用程序在其主事件循环线程上进行网络连接，但非常不鼓励这样做。

查看我在以下帖子中的答案以获取解决方案：

java.util.zip.GZIPInputStream.close 能否导致android.os.NetworkOnMainThreadException

Answer 2

似乎堆栈跟踪非常有用。如果您尝试在主 (UI) 线程上执行长时间运行的工作，则 Strictmode 会引发异常。

Android 线程模型有两个规则：

1. 不要在主线程上做长时间的工作
2. 不要从 UI 线程外部更新 UI

你违反了这些规则中的第一条。